The tweet comes after a Washington Post report published Friday that said Trump’s son-in-law Jared Kushner, who is also a senior adviser to the President, had worked to establish a secret communications channel with the Kremlin — proposing that idea in a meeting with Russian Ambassador Sergey Kislyak in December. Former National Security Adviser Michael Flynn, who resigned amidst controversy over his own contact with Kislyak, was also present at that meeting, according to the Post.

Reuters also reported Friday that Kushner had more than three previously undisclosed contacts with Kislyak during the 2016 election.

The Post cited “U.S. officials briefed on intelligence reports” as their sources. The New York Times, who also reported the story, cited “three people with knowledge of the discussion.”

The White House declined to comment Friday to the Post and the Times, but the President tweeted Sunday that he thinks the anonymity of these sources means they don’t exist.

Whenever you see the words 'sources say' in the fake news media, and they don't mention names….

But even though Trump is questioning these sources now, one of his tweets from 2012 began recirculating Sunday. The tweet referenced his own unnamed source discussing Trump’s claims that then-President Obama wasn’t born in the United States, which was ultimately disproven.

An 'extremely credible source' has called my office & told me that @BarackObama applied to Occidental as a foreign student–think about it!

Trump had posted to his Twitter account while he was abroad, but never about the headlines relating to Kushner and the federal probe into Russia’s interference in the 2016 election. Right before the President left for his trip, Deputy Attorney General Rod Rosenstein appointed former FBI Director Rob Mueller as a special prosecutor to assume control of the matter.

Trump also weighed in on another matter Sunday —the special election to fill Montana’s sole congressional seat. Republican candidate Greg Gianforte won the election, just hours after he was charged with a misdemeanor for allegedly body slamming a Guardian reporter who was asking him questions about the Republican healthcare bill.

Trump did not comment on the body slamming incident. He did, however, criticize the coverage.

Does anyone notice how the Montana Congressional race was such a big deal to Dems & Fake News until the Republican won? V was poorly covered